Throughout Hyrule are temples acting as trials for Link to conquer to acquire important items and eventually defeat the bosses that are guarding the key quest items to eventually destroy the barrier blocking Hyrule Castle as well as confront Zant directly at the Palace of Twilight. In these structures navigation requires usage of the hero's abilities and the items scattered across the region as well as the many keys that allow access into locked rooms which lead deeper into the dungeon.
While all dungeons feature this basic structure some have unique keys and dungeon items in addition to the standard map and compass. Also in the overworld there are a few areas that feature a Small Key one held by Coro, another in a cavern inside Faron Woods, a couple being held onto by King Bulblin, and one on a Bulblin guarding the gate leading to Arbiters Ground featured in the Bulblin Camp.
Snowpeak Ruins features a unique set of additional items that act as psuedo keys for the dungeon in addition to the standard keys which are the Ordon Pumpkin and Ordon Goat Chese respectively. This dungeon also features a uniquely designed big key being the Bedroom Key which was used to lock the room were a missing piece of the Mirror of Twilight rests.